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Running Down Tool

used to reduce the diameter of round stiock

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John Weight26/03/2014 07:43:42
56 forum posts
14 photos

I seem to remember seeing, either in one of the Magazines or on here someone describing a tool to reduce the diameter of round material for instance to reduce 5/16 round to take a quarter inch thread. Can anyone offer any help on such a tool? I should be most grateful, many thanks.


john kennedy 126/03/2014 08:10:48
214 forum posts
24 photos

Is this what you mean.? Shame they are out of stock.

Ian S C26/03/2014 09:27:55
7468 forum posts
230 photos

John, here are two sites.1995 Vol175 no., 3999, Page 238. Fixed size running- down tool. By Peter Spenlove - Spenlove.

2004 Vol 193 no., 4228, page 214. Setting up the Clarke CL 300M lathe. Both these in ME.

Ian S C

IanT26/03/2014 09:31:26
2005 forum posts
212 photos

I've got one similar to the Chronos one John (I may have brought it from them in fact) but it occurred to me later that it should be possible to modify one of my standard toolholders to take a front guide extension.

This would be a flat plate screwed to the front that could be simply bored to take the guides. I'd set the holder to centre height with the tool inserted, remove the tool, then screw the holder on and bore it at that height, I think it would probably work just fine.



daveb26/03/2014 10:57:19
626 forum posts
14 photos

Capstan lathe roller box, available in all sizes from very small to huge, frequently appear in on-line auctions at modest cost, I use one with a 5/8" shank fitted to a block on the cross slide.

John Weight26/03/2014 19:14:57
56 forum posts
14 photos

Many thanks to all those who replied to my question, I have one which I made way back very similar to the one in ME and also the one described by Peter Spenlove-Spenlove. However the one lurking in the depths of my mind (a dark place indeed) looked something like a spotfacing tool but with a hole through rather than a centre pin. Again many thanks for the help extended.


Neil Wyatt26/03/2014 19:51:45
19079 forum posts
736 photos
80 articles

You are thinking of a rose bit. Described by Tubal Cain in ME also in one of his WPS books. File four teeth on the end of a hollow cylinder of silver steel (copy an end mill, but don't bother with flutes), harden and temper.

> 2004 Vol 193 no., 4228, page 214. Setting up the Clarke CL 300M lathe. Both these in ME.

Comes highly recommended

Most of the time I use a bar clamped to the toolpost with a hole in it, just ahead of the tool tip. I've reduced the diameter of 1/16" welding rods this way.


RJW26/03/2014 20:00:43
343 forum posts
36 photos
John, can't say I've ever seen that type of tool for running down bar stock, would you be confusing the tool used for making wooden dowels?
I would think a similar tool could be knocked up for metal!

I have a set of spot facing cutters in my Bergeon clock bushing outfit which are hollow centred if the pilot is taken out, they will certainly cut a boss on brass, so would think in principle at least, a similar tool would reduce the diameter of a steel

Edit: Neil beat me to it while I was typing! ;>)Edited By RJW on 26/03/2014 20:03:06

Graham Green 303/04/2014 12:38:38
18 forum posts

Go get hold of 'Making Small Workshop Tools' by Stan Bray, page 64----- A Rose Bit, page 67---- A Box Tool.

The box tool, maybe that's what your thinking of.

The box tool is just the ticket for doing what you want to do, I made two of these, one for for making 12 BA coach bolts and the other for making 10 BA coach bolts.

I use bronzing rods for making the miniature coach bolts, for 12 BA I use the 1.6mm and for the 10 BA, I use the 2.4mm rods.

Got photo's of the box tools I made, if you want them.

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